Stop-cocking valve



Oct. 29, 1929. G. c. DAVIS 1,733,528

STOP cocxrue VALVE Filed Oct. 8, 1924 fnve/nz or. Q60?" 6 CLDaZ/Zp' W 4-W Aztarnqys."

Patented Oct. 29, 1929 P TE T orrice 7 GEORGE CQDAVIS, or oHicAeo,runners, Assmnon r0 a. M nAvis R enLA'ron cont- PANY,

or'oHIoAGo, ILLINOIS, A CORPORATION oFI LIN'oIs s'ror-oooKmG VALVEApplication filedOctober s, 1924. Serial No. 742,313.

My invention relates to improvements in stop cocking valves for useinconnection with stop cocking or automatic self pumping oil wells and thelike and it has for one object to provide a new and improved form ofstop cocking valve which can be set automatically to open when thepressure in the well reaches a predetermined point 'and to close whenthe pressure drops to a predetermined point. Among the objects ofmyinventionis'the provision of a device whiclrwillopen and closesuddenly,thus'making thechange from a condition of flowandreductionofpressure toa condition of lack of flow and building up ofpressure andvice' versa; sudden and complete. It will be understoodthatsuch a valve as this is used'in connection with oil wells where thepressure is" not suflicient to cause the well to flow at all times butwhere the pressure it entrained will gradually build up to a point atwhich sudden release will permit the pressure to blow out some of theoil, and, my valve is intendedto automatically open and close so thatwhen the presure has built up to a point at which it will discharge oilfrom the well, the valve suddenly opens and the gas rushes outentraining with it oil, this continuing until the pressure, drops to apoint at which the gas can no longer discharge theoil,

when the valve automatically closes again to permit building up.

This condition can be. produced I n wells without gas pressure byintroducing air under pressure into the casing at a relatively low rateand allowing the air pressure to build up, then I opening the valveautomatically in the same way and allowing the air pressure to. eyectthe oil. When this is done, it is necessary only that the airpressurepipe be small enough so that during the time when the dischargevalve is open to permit flow of oil, there will not be an unreasonablewindage of the air, as it is most satisfactory to leave the, airpressure opening open at all times. Other'objects will appear from timeto time in the spec ficatmn and claims. I i My inventiondiagrammatically in theaccompanylng drawing's, wherei'n is illustratedmore or less The figure is a longitudinal section through the valve.

Like parts are indicated by like characters I throughout. I,

A isa valvehousing. Into it leadsan intake plpe A From it leads adischarge pipe A A is the intake side" of the valve and*A* the dischargeside. These sides are separated by a closureorpartition A, having twoopposed valve seatrings A A. threaded in place and forming the valveports. A A 'are valve discs joined by the central stem A and pros videdWith guide fingers A adapted to center the discs in the seatswhilepermitting free flow when the valves are open. A is i a yoke associatedwith oneof thediscs A;

Projecting upwardly fro th yo 10 a free to move laterally therein is adumbbell shaped connecting rod free to move through predetermined limitswith respecttoa yoke B This yoke B is pivoted on a hub B and a coilspring B passes through the dumb-bell shaped connecting rod B andengages the top of one ofthe valve discs A at one endand the hub B atthe otherend and is held under pressure to hold the'parts yieldingly toprevent chattering and the like. B is a dash pot piston slidable inthecylinder B which projects outwardly from the housing This dash I ipot piston is provided with a packing ring B held in place bythe washerB and the hub B tween the inner wall of thelplunger and the g outerperiphery of the flange. B is oil or suitable liquid materialheld withinthe cylinder and adapted to be expelled from between the plunger and thecollar or flange B when ing from the 'topof the'cylinder B immediatelybelow. the cap B to a discharge pipe B surrounded by a housing B, therebeing air holes B 5 leading out from the housing. This the plunger movesup. a B is a passage leadcylinder serves as a reservoir for the ejectedi oil when the plunger moves up and'is ar ranged to permit theoil todrain back gradg I ually when the plunger moves down.

.threaded a guide pin D wardly against the stem and into engage mentwith the sear by the spring C in the pivot leverC C is a stop limitingthe out ward movement of'the triggerunder the urge The lever C ispivoted on the pin C on a yoke C and it is provlded of the spring C.

at its outer end with a notch C riding on a pin O D; is a'col'larresting on the; valve housing and surrounding the cylinder B D is a lugprojecting laterally: therefrom: and has pivoted thereon a socket D inwhich is This guide pin passes up; through a block D which carries thepins- C D limits upwardly movement of thetrunnion block vand as rin Dsur- C) rounds I the pin 1B and is; introduced between the; trunnionblock: and a collar D. D is a nutthreaded' on the; pin D adapted to adjust the position-10f the collar to adjust the tension of the-spring. mIt will be understood that as pressure buildsup in the intake side ofthe valve and the plunger is moved up the lever will be rotated,compressing the spring 1) until the pressurereaches a predeterminedpoint. at which time the spring,

will: be'sufiiciently compressed to permit the trigger to. disengage,fromthe sear, thus allowing theplunger to rise and carry Wltll' 1t thevalve. The clearancebetween the port end of the dumb-belL shapedconnecting rod 33 and the yolre'B permits this upward movement'of theplunger to free the latch when unseati-ng thevalve;anditwill bev notedthat the dumb-bell; shaped connecting rod is long enough so that evenifthe latch or trigger has been free',the valve isnot; unseated until theplungeris on: itsupward' movement, thus adding the hammer blow of themoving parts of the plunger to the pressure thereof to: positivelyunseat the valve.

Eisa: yoke projecting upwardly from the cylinder B carrying a. spring,housing E This housingcontains,azspring E compressed between'the' collarE on the upper end of the valve stem G and a collar E in the housingadaptedto be downwardly adjusted by means of a set screwEY When thetrigger is-released and: the valve stem,.plunger;and valve travel up thespring 1 E -is compressed; The pressure and inertia of the parts issuflicient to move the? valve stem up: until the ball stop 0 engages.the notch G yieldingly locking the valve and as;- sociated parts in theupward position with the spring E compressed. The compressionv of thespring E is, not suflicient when the valve first opens to overcome. therelaitself drops beyond a certain point, the low pressure spring whichwas not strong enough to overcomeboth the gas pressure and the latchpressure will be strong enough to overcome the latch pressure and will.torce the valve and its associated parts suddenlydown, the inertia beingsuflicient to overcome; the final pressure and seat the valve, thusmaking both opening and closing positive and sudden. On the downmovement, the sear collar engages the surface of the trigger, forces inthe spring to permit passage down ward of the sear.

The pressure at which the valveopens is set by adjusting the highpressure spring D9. The pressure at which. the valve. closes is set byadjusting. the low pressure spring E 7 It will be evident that while Ihave shown in my drawings an operative device, still many changes mightbe made in. thesize, shape and disposition of parts without departingmaterially from the spirit of my in;- vention and I wish, therefore,that my showing be taken asinia sense diagrammatic" I claim: 7 V

l. A stop cocking valve for oil wells. and thelike comprising a valvehousing, a valve member therein, a. control plunger exposed on one sideto the pressurein the valve hous ing, a connection between the plungerand the valve member, a yieldingly held stop for resisting the movementof the plunger and holding the valve member seated, tlieyie'lding stopholding meansbeingadapted'to permit the stop to release th'epl'ungerwhen the pressure on the plunger reaches a predetermined point, theconnection between the plunger and the valve member beingloose to permitmovement of the plunger and release of the stop before the valve memberisili'fted, yielding means interposed. between the plunger and valvemember. tending to hold themin separated position. h

2. The combination with a valve member and seat of avalveactuatingg'elementradapted toengage the valve. member directly to seatit, a tension member interposed. between the valve actuating elementand. thevalve memher to permit the actuating, member to unseat thevalve, there being play in the tension member to permit the valveactuating member to. move in the unseating direction before the valveresponds to theunseating movement, a trigger release for holding thevalve actuating member in the closed position, the play between theactuating member and the connection being such that there is move- Ament of the valve actuating member in the opening direction after thetrigger has been released and before the valve commences to move fromits seat.

3. A valve for stop cooking oil Wells and the like comprising a housing,valve seat, a

valve in opposition to said seat, a valve stem projecting outwardlythrough the housing, yielding means operating upon the valve stemtending to hold the valve in the seated position, a pivoted latchengaging the, projection on the valve stem, yielding means for resistingrotation of the latch; said means being adapted When the pressureexerted by the valve stem exceeds a predetermined point to permitrelease of the stem and a connection between the valve and the valvestem whereby movement of the stem in opposition to the latch takes placeWithout moving the valve previous to the release of the latch.

Signed at Chicagov county of Cook and State of Illinois, this 20th dayof September,

GEORGE C. DAVIS.

